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O: Fachverband Oberflächenphysik
O 28: Solid-Liquid Interfaces II: Structure and Spectroscopy
O 28.6: Vortrag
Dienstag, 19. März 2024, 11:45–12:00, H 1012
Visualizing solvent structures at electrified solid-liquid interfaces by electrochemical atomic force microscopy — •Andrea Auer1,2, Thorben Eggert3, Nicolas G. Hörmann3, Karsten Reuter3, and Franz J. Giessibl1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Institute of Physical Chemistry, University of Innsbruck, Austria — 3Fritz-Haber-Institut der Max-Planck-Geselleschaft, Berlin, Germany
To design efficient electrochemical interfaces for sustainable energy conversion, it is crucial to resolve the molecular structures of the electric double layer, where inevitably all electrocatalytic reactions take place. Here, we employ electrochemical atomic force microscopy (AFM) with stiff qPlus sensors[1,2], which allows us to probe the potential-dependent, vertical solvent layering at well-defined electrified solid-liquid interfaces with high spatial resolution. Investigations of a Au(111) electrode in various aqueous electrolytes reveal distinct oscillatory frequency shift modulations in z-direction. Depending on the applied potential, the charge of the electrode and the type of ions, we attribute these oscillations to water and/or ion layering close to the electrode, which we can correlate with atomistic molecular dynamics simulations.
[1] F.J. Giessibl, Rev. Sci. Instrum. 90, 011101 (2019). [2] A. Auer, B. Eder and F.J. Giessibl, J. Chem. Phys. 159, 174201 (2023).
Keywords: electrochemical AFM; electrified solid-liquid interfaces; solvent structures; Au111; molecular dynamics simulation